How to attach files to a tape? I backed up some files to a tape

[mm8294]

using command 'tar -cf ......', and today we need to backup some other files to the end of the same tape. 'tar -cf' won't work because it will rewind the tape first and the files we backed up yesterday will be removed. Could anybody help us to do this?

Thank you so much.

 

[Guest_imported]

hi,


try to use the device with rewind.

ex. instead of using /dev/rmt/0 use /dev/rmt/0n

good luck....

 

[FarahRegal]

the fastest way to rewind the tape without using mt,
from a korn Shell or bourne, just type
# < /dev/rst8

.

Farah regal
good luck
&quot;think twice and hit enter once&quot;

 

[ady2k]

You can use ufsdump for backup.
The ufsdump can only backup some files have changed it.You don't worry. Your existing backup will remove it.
Before you used this command :
# ufsdump -9uf /dev/rmt/0 /opt (only backup for some files changed/updated)
You should do the full backup first with this command :
# ufsdump -0uf /dev/rmt/0 /opt (Full backup)
It will be other option for your backup.

 

[KenCunningham]

You need to position the tape to the end of your first save. To do this, use:

mt -f /dev/rmt/0n fsf 1

This positions the tape to the end of your first save. I have assumed here that you have only the one save on the tape at the moment. If there are more, replace 1 with whatever number is appropriate. As mentioned by shadow_eye, the /dev/rmt/0n indicates the no-rewind version of the tape device. Hope this helps.

 

[mm8294]

Thank you so much, guys. All messages are very helpful. I will try it tomorrow and hope it works.

Thank you very much again.

 

[mm8294]

Guys:

It does not work for me. Below is what I did:

1. insert a new tape.
2. tar cf /dev/rmt/0 file1
3. tar tvf /dev/rmt/0:
> file1
4. mt -f /dev/rmt/0 fsf 1
5. tar cf /dev/rmt/0n file2
6. mt -f /dev/rmt/0 rew
7. tar tvf /dev/rmt/0n:
> file2
8. tar tvf /dev/rmt/0:
> file2

The results are the same even if I skip step 6.

Any suggestion?

Thank you very much.

 

[mikeclark]

You need to address the tape drive as a non rewind device for each command.
Use /dev/rmt/0n onstead of /dev/rmt/0.

 

[KenCunningham]

As I think Mike is saying, you need to use the no-rewind device (dev/rmt/0cn) in step 4. Cheers.

 

[mm8294]

It works! You guys are right!

Thank you so much for all your help.